Mazda CX-5 2019 — technical service bulletin
Bulletin 5421K · NHTSA communication 10208601 · issued Feb 10, 2022
Technical service bulletin
communication type
Equipment
component
2019
model years
1
vehicle entries
Official summary
There is a SCR/ AWD harness that has a unique routing, over the SCR tank cover. Over time, contamination (i.e. sand, dirt) on the SCR/AWD harness may cause wear on the harness wiring and insulation due to vibration of the SCR tank cover. In the worst-case scenario, the electrical circuits in the wiring harness can be disconnected with the MIL/SCR/4WD warning lights illuminating. Inspect the SCR/AWD harness for signs of damage. If the CORE WIRES inside the harness have no damage, protective shrink tubing will be installed on the harness. If CORE WIRE damage is found in the harness, the harness
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.